1. From the Cardiovascular Research Institute Maastricht, University of Maastricht (M.v.E., J.P.M.C., B.J.J.), and the Department of Cardiology, Academisch Ziekenhuis Maastricht (H.J.J.W., P.A.D.), Maastricht, Netherlands; and the Medizinische Universitäts-Poliklinik, Bonn, Germany (C.G.).